A lightning rod is also known as a "lightning conductor," "thunder rod," or "lightning arrester." It is a metal rod attached to a building or structure designed to protect it from lightning strikes. Another synonym for a lightning rod is a "grounding rod," which is used to discharge excess electrical current. A "lightning needle" is a small lightning rod used on top of chimneys or spires. In aviation, the equivalent term for lightning rod is a "static wick" or "static discharge wand," which is a device designed to reduce static electricity buildup on the plane's surface. Lastly, a "Franklin rod" is a specific type of lightning rod invented by Benjamin Franklin in the 18th century.